Nissan Sentra B18 (2020-2025) Service Manual: Compressor Does Not Operate
Diagnosis Procedure
Symptom: A/C compressor does not operate.
Note:
-
Perform self-diagnoses with CONSULT before performing symptom diagnosis. If DTC is detected, perform the corresponding diagnosis.
-
Check that refrigerant system is properly charged. If refrigerant amount is below the proper amount, perform inspection of refrigerant leakage.
-
CHECK MAGNET CLUTCH OPERATION
-
Check magnet clutch. Refer to Component Function Check.
Does it operate normally?
YES >>GO TO 2.
NO >>Repair or replace malfunctioning parts.
-
-
CHECK REFRIGERANT PRESSURE SENSOR
-
Check refrigerant pressure sensor. Refer to Component Function Check.
Is the inspection result normal?
YES >>GO TO 3.
NO >>Repair or replace malfunctioning parts.
-
-
CHECK A/C AMP. OUTPUT SIGNAL
-
CONSULTSelect “FAN ON” and “AIR COND SW” in “Data Monitor” mode of “BCM”.
Monitor item
Condition
Status
AIR COND SW
A/C switch
ON
On
OFF
Off
FAN ON
Blower motor
ON
On
OFF
Off
Is the inspection result normal?
YES >>GO TO 4.
NO >>Replace A/C switch assembly. Refer to Removal and Installation.
-
-
CHECK ECM INPUT SIGNAL
-
CONSULT
Select “AIR COND SIG” and “HEATER FAN SW” in “Data Monitor” mode of “ENGINE”.
Monitor item
Condition
Status
AIR COND SIG
A/C switch
ON
On
OFF
Off
HEATER FAN SW
Blower motor
ON
On
OFF
Off
Is the inspection result normal?
YES >>GO TO 5.
NO >>Check CAN communication system. Refer to Trouble Diagnosis Flow Chart.
-
-
CHECK IPDM E/R INPUT SIGNAL
-
CONSULT
-
Start engine.
-
Select “Compressor request 1” in “Data Monitor” mode of “IPDM E/R”.
Monitor item
Condition
Status
Compressor request 1
A/C switch
ON
On
OFF
Off
-
Is the inspection result normal?
YES >>Inspection End.
NO >>Check CAN communication system. Refer to Trouble Diagnosis Flow Chart.
-
Insufficient Heating
Component Function Check
Component Function
Check
SYMPTOM: Insufficient heating
INSPECTION FLOW
CONFIRM SYMPTOM BY PERFORMING OPERATION
CHECK - TEMPERATURE INCREASE
...
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